End of the jab:

Patch heralds new era in battle against pandemics

Scientists unveil an innovative and cheap method of delivering vaccines without the need for needles or medical experts

A revolutionary way of vaccinating against infectious diseases has been invented by scientists who have developed a skin patch containing an influenza vaccine.

The patch does away with needles and syringes and could transform the battle against future pandemics by painlessly inoculating patients with vaccines that could be sent out in the post and self-administered in the home by somebody with no medical experience.

In the developing world, the skin patches could eliminate the need for the costly medical infrastructure of mass-vaccination campaigns, which require trained medical personnel to inject vaccines, and expensive storage equipment. Skin patches also bypass the hazards of dirty needles.

The skin patch is "armed" with an array of microscopic needles made of biodegradable plastic that painlessly scratch the surface of the skin and dissolve harmlessly without trace after delivering the vaccine safely inside the body.

Tests have shown that the patch works just as well and possibly even better than conventional vaccines injected into the body with needles and syringes. The skin patches are biodegradable and, unlike dirty needles, there is no risk of accidental skin pricks and cross-contamination.

Experiments on laboratory mice showed that the skin patches are even better than injectable vaccines at preventing flu infections because the vaccine enters the body via the surface of the skin, which is an important site of the immune system. Most flu jabs, by comparison, deliver the vaccine into the muscles, which may not be the best place for triggering the all-important initial immune reaction.

Experts believe that, if immunisations against flu and other infectious diseases can be delivered by skin patches, it would vastly improve the availability of vaccines in the developing world, where inoculating with needles and syringes is often prohibitively expensive because of the costs of trained medical staff. In addition, skin patches do not need to be stored in refrigerators and they would solve the problem of re-using dirty needles and their safe disposal.

Professor Mark Prausnitz of the Georgia Institute of Technology in Atlanta, who led the research team, said the microneedle skin patch has the potential to revolutionise the way vaccines are delivered and administered because it is so simple and safe to use.

"The dissolving microneedle patch could open many new doors to immunisation programmes by eliminating the need for trained personnel to carry out the vaccination. This approach could make a significant impact because it could enable self-administration as well as simplifying vaccination programmes," Professor Prausnitz said.

"In this study, we have shown that a dissolving microneedle patch can vaccinate against influenza at least as well, and probably better than, a traditional hypodermic needle," he added.

Mice immunised with the skin patches shrugged off a subsequent infection with influenza virus a month after being vaccinated, just as well as mice inoculated with needles. However, when they were subjected to a second flu infection three months after vaccination, the mice with skin patches were better able to clear flu virus from their lungs compared to conventionally vaccinated mice, according to the study, which was published in the journal Nature Medicine.

The scientists believe this difference between the two groups of vaccinated animals is due to the inoculation occurring via the skin rather than the muscle. "The skin is a particularly attractive site for immunisation because it contains an abundance of the types of cells that are important in generating immune responses to vaccines," said Professor Richard Compans of Emory University School of Medicine, who collaborated on the study.

Ioanna Skountzou of Emory University said the vaccine molecules were freeze-dried and are stuck to the microneedles at room temperature using ultraviolet light. "Another advantage of these microneedles is that the vaccine is present as a dry formulation, which will enhance its stability during distribution and storage," Dr Skountzou said.

Sean Sullivan, of the Georgia Institute of Technology, added: "We envision people getting the patch in the mail or at a pharmacy and then self-administering it at home. Because the microneedles on the patch dissolve away into the skin, there would be no dangerous sharp needles left over."

The microneedles are just 650 microns in length – about six times the thickness of a human hair – and are thought to be too short to stimulate the skin's pain receptors while long enough to penetrate through the skin's outer protective layer.

Further trials in animals will still need to take place before the skin patches can be tried on human volunteers. It may still take many more years of clinical trials, however, before vaccination by skin patch becomes routine.

The plastic polymer that is used to form the microneedles of the skin patch, polyvinylpyrrolidone, is already being used in medical equipment placed inside the body with no serious side-effects. Scientists believe that vaccinating by skin patch could result in lower doses of vaccine being used because the skin is a more effective site of the body for inoculation.

Special immune cells in the skin are designed to capture foreign particles or the "antigens" present in vaccines, making vaccination by skin patch more efficient, the scientists said.

"The use of needles measuring just hundreds of microns in length not only eliminates pain and enables simple delivery through a thin patch, but also inherently targets antigens to the abundant antigen-presenting cells of the skin's epidermis and dermis," say the scientists in their study.

How the patch works

*Each skin patch is armed with about 100 microneedles that have been covered with molecules of the freeze-dried vaccine. When the needles penetrate the skin, they dissolve away within a few minutes, delivering the vaccine to the important cells of the body's immune system, which are always present in the skin.

*Scientists believe that when mass produced, the skin patches could work out to be no more expensive than conventional vaccines delivered by needles and syringes. However, the overall costs of a vaccination programme should be lower because skin patches would not require expensively-trained medical personnel, or the costs of disposing of hazardous waste in the form of dirty needles.

Start your day with The Independent, sign up for daily news emails
ebooks
ebooksAn introduction to the ground rules of British democracy
Latest stories from i100
Have you tried new the Independent Digital Edition apps?
SPONSORED FEATURES
Independent Dating
and  

By clicking 'Search' you
are agreeing to our
Terms of Use.

iJobs Job Widget
iJobs General

Recruitment Genius: Personal Tax Senior

£28000 - £37000 per annum: Recruitment Genius: This is an opportunity to join ...

Recruitment Genius: Customer and Markets Development Executive

£22000 - £29000 per annum: Recruitment Genius: This company's mission is to ma...

Recruitment Genius: Guest Services Assistant

£13832 per annum: Recruitment Genius: This 5 star leisure destination on the w...

Recruitment Genius: Sales Account Manager

£20000 - £32000 per annum: Recruitment Genius: A Sales Account Manager is requ...

Day In a Page

A nap a day could save your life - and here's why

A nap a day could save your life

A midday nap is 'associated with reduced blood pressure'
If men are so obsessed by sex, why do they clam up when confronted with the grisly realities?

If men are so obsessed by sex...

...why do they clam up when confronted with the grisly realities?
The comedy titans of Avalon on their attempt to save BBC3

Jon Thoday and Richard Allen-Turner

The comedy titans of Avalon on their attempt to save BBC3
The bathing machine is back... but with a difference

Rolling in the deep

The bathing machine is back but with a difference
Part-privatised tests, new age limits, driverless cars: Tories plot motoring revolution

Conservatives plot a motoring revolution

Draft report reveals biggest reform to regulations since driving test introduced in 1935
The Silk Roads that trace civilisation: Long before the West rose to power, Asian pathways were connecting peoples and places

The Silk Roads that trace civilisation

Long before the West rose to power, Asian pathways were connecting peoples and places
House of Lords: Outcry as donors, fixers and MPs caught up in expenses scandal are ennobled

The honours that shame Britain

Outcry as donors, fixers and MPs caught up in expenses scandal are ennobled
When it comes to street harassment, we need to talk about race

'When it comes to street harassment, we need to talk about race'

Why are black men living the stereotypes and why are we letting them get away with it?
International Tap Festival: Forget Fred Astaire and Ginger Rogers - this dancing is improvised, spontaneous and rhythmic

International Tap Festival comes to the UK

Forget Fred Astaire and Ginger Rogers - this dancing is improvised, spontaneous and rhythmic
War with Isis: Is Turkey's buffer zone in Syria a matter of self-defence – or just anti-Kurd?

Turkey's buffer zone in Syria: self-defence – or just anti-Kurd?

Ankara accused of exacerbating racial division by allowing Turkmen minority to cross the border
Doris Lessing: Acclaimed novelist was kept under MI5 observation for 18 years, newly released papers show

'A subversive brothel keeper and Communist'

Acclaimed novelist Doris Lessing was kept under MI5 observation for 18 years, newly released papers show
Big Blue Live: BBC's Springwatch offshoot swaps back gardens for California's Monterey Bay

BBC heads to the Californian coast

The Big Blue Live crew is preparing for the first of three episodes on Sunday night, filming from boats, planes and an aquarium studio
Austin Bidwell: The Victorian fraudster who shook the Bank of England with the most daring forgery the world had known

Victorian fraudster who shook the Bank of England

Conman Austin Bidwell. was a heartless cad who carried out the most daring forgery the world had known
Car hacking scandal: Security designed to stop thieves hot-wiring almost every modern motor has been cracked

Car hacking scandal

Security designed to stop thieves hot-wiring almost every modern motor has been cracked
10 best placemats

Take your seat: 10 best placemats

Protect your table and dine in style with a bold new accessory